package com.hmdp.utils;

import com.sun.el.parser.AstTrue;
import org.springframework.core.io.ClassPathResource;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.data.redis.core.TimeoutUtils;
import org.springframework.data.redis.core.script.DefaultRedisScript;

import javax.annotation.Resource;
import java.util.Collections;
import java.util.UUID;
import java.util.concurrent.TimeUnit;

public class SimpleRedisLock implements ILock{
    @Resource
    private StringRedisTemplate stringRedisTemplate;
    private String name;
    private static final String KEY_PREFIX= "lock:";
    private static final String ID_PREFIX= UUID.randomUUID() + "-";
    private static final DefaultRedisScript<Long>UNLOCK_SCRIPT;
    static {
        UNLOCK_SCRIPT = new DefaultRedisScript<>();
        UNLOCK_SCRIPT.setLocation(new ClassPathResource("unlock.lua"));
        UNLOCK_SCRIPT.setResultType(Long.class);
    }
    public SimpleRedisLock(String s, StringRedisTemplate stringRedisTemplate) {

    }

    @Override
    public boolean tryLock(long timeoutSec) {

        //获取线程标识
        String threadId =ID_PREFIX + Thread.currentThread().getId();
        //获取锁
        Boolean success = stringRedisTemplate.opsForValue()
                .setIfAbsent(KEY_PREFIX + name, threadId , timeoutSec, TimeUnit.SECONDS);
        return Boolean.TRUE.equals(success);
    }

    @Override
    public void unlock() {
       stringRedisTemplate.execute(
               UNLOCK_SCRIPT,
               Collections.singletonList(KEY_PREFIX + name),
               ID_PREFIX + Thread.currentThread().getId()
       );
    }
    /* //获取线程标识
        String threadId =ID_PREFIX + Thread.currentThread().getId();
        //获取锁中的线程
        String lockId = stringRedisTemplate.opsForValue().get(KEY_PREFIX + name);

        if (threadId.equals(lockId)) {
            //释放锁
            stringRedisTemplate.delete(KEY_PREFIX + name);
        }*/
}
